<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<script src="https://unpkg.com/vue@next"></script>
<body>
    <div id="root"></div>    
</body>
<script>
    const app = Vue.createApp({
     data() {
         return {
            message:'',
            message1: true,
            message2:[],
            message3:' '
         }
     },
     methods: {
         
     },
     template: `
     <div >
        {{message2}}
        <select v-model="message2" multiple>
            <option value="A">A</option>
            <option>B</option>
            <option>C</option>
         </select>
     </div> 
     `
    })

    const vm = app.mount('#root')
 </script>
</html>
<!-- 
select

 -->